Is D2 a "modern" steel? Marbles has or had a sowbelly stockman with black micarta covers and D2 blades.
View attachment 1940198
Marbles
might have a couple new knives out in D2.
Rough Ryder currently has a medium stockman and a couple other patterns with V10 blades, with blue and silver aluminum covers.
Lion Steel has some with M390, but I believe most are a single blade, although I think the "Groomsman" and the Barlow are available as a two blade.
While not a "modern" steel or a "super steel" by today's standards, Böker TREE BRAND with the Solingen, Germany tang stamp, makes a couple patterns with 440C blades. You'll have to check with the GEC experts, but I believe GEC has done a limited number of runs using 440C, as well.
440C was/is the original high wear resistance (and hence "difficult" to sharpen) "super steel". It will take and hold a keen edge down to 12~12.5° per side/24~25° inclusive edge, without a "micro bevel", without danger of chipping.
Buck offers S30V or other "super steels" on a limited number of knives in their Custom Shop. Sadly, all are single blades, like the 110/112, a couple of their one hand openers, and a couple fixed blades.
If you can find a 2018 Blade Forms two blade 301
View attachment 1940219on the secondary market, it has CPM154 blades.
SK Blades and Copper & Clad used to have Buck SFO's with blade steels not normally available, such as CPM154, D2, and 5160, but I don't think either did a run of the 300 series knives. SK Blades was going to do a 301. However, the guy in charge of scheduling SFO's resigned, then shortly after that, the Covid's struck. Buck has pretty much stopped making dealer exclusive SFO's, from what I understand.
As others have said, many generations have used simple steels like 440A; 420HC; and 10xx for whittling.
A couple advantages of the simple "obsolete" (note quotes) steels are ease of sharpening, and they can be taken to a super keen 20° inclusive edge (without a "micro bevel") without chipping. In the rare instance the edge rolls, a quick stropping or a couple swipes on a Butcher's Steel (which contrary to popular belief does
not remove any blade metal) will fix the rolled edge. Another advantage is the keen 20° inclusive edge holds a working edge longer than a wider/thicker edge.
